MALE ORGANS OF GENERATION. 207 



end of the sperm duct, it appears in the Lamellicornia, in Senil/tix, 

 Tipula ; as a large ovate distension, at the end of the sperm duct in 

 Hydrophilus (PL XXX. f. 10.) and Apis ; as a peculiar appendage to 

 the sperm duct, in Phryganea (PL XXX. f. 6. &.>.). In Lylta, Meloc, 

 and many others, we find but one sperm bladder, which has originated 

 from the union of both the sperm ducts ; into this the lace-shaped 

 epidydimis then empties itself. 



150. 



PECULIAR APPENDAGES. 



We perceive appendages to the male organs similar to those glandular 

 ones we noticed above in the female sexual organs. With respect to 

 their peculiar purpose, we know certainly as little as of the true 

 function of the vessels accessory to the female organs ; but it is just 

 as probable that here as there they are gluten secreting organs, and, 

 consequently, glandular. That such appendages are not absolutely 

 necessary, is proved by the circumstance, that, as in the female, so also 

 in the male sexual organs, they are frequently entirely wanting, and 

 that sometimes they correspond in both sexes, as in Musca, Donacia, 

 Semblis ; in other cases are found only in the female, as in Tipula, 

 Ephemera, and Nepa ; and in others again are found in the male 

 alone, as in Pterophorus and Cercopis. This deficiency of them in 

 one sex, when present in the other, speaks against the opinion of 

 Suckow*, according to whom they secrete urine; for this would 

 necessarily be peculiar to both sexes, but which does not invalidate 

 their being gluten secreting vessels of the sexual organs, which in 

 general in male individuals are much more numerous, and are of a 

 different form and situation to those found in the female. These 

 appendages are also found where urinary organs show themselves, as in 

 the Carabodea and Hydrocantharides. Comp. 114. 



If we more closely investigate the number and the form of these 

 appendages, their first and most important character is their almost 

 symmetrical situation and equal number. Tipula and Blatta only, as 

 far as our knowledge extends, make an exception to this rule ; as in 

 Tipula (PL XXX. f. 14.), according to Suckow, an uneven clavate 

 process is found at the point of union of both sperm ducts, which, 

 according to all analogy, can be explained only as a gluten organ, 



* Housing , vol. ii. p. 248. 



